What is an IP calculator and what can it do for us

An IP calculator is a tool that will allow us to calculate the number of subnets of a larger network, the number of hosts that fit in a given subnet with the subnet mask, and it will even allow us to correctly size the different subnets that we have in our home. or in the company. IP calculators allow us to calculate everything necessary without having to do the operations manually. Thanks to these calculators, network administrators will obtain all the necessary information to correctly configure network addressing.

Before talking in detail about IP calculators, we must be clear about a series of basic and fundamental concepts, such as what an IP is, the difference between public and private IPs, in addition to the different classes of IPv4 addresses that currently exist.

What is an IP and differences between public and private IP

An IP address is a  logical and unique identifier for each of the computers connected to a network . When we talk about IPs, we could say that there are basically two types:

  1. Public IP
  2. Private IP

The public IP could be considered as the identifier of our network facing the Internet, this public IP address is provided directly by our Internet operator, and is normally static or dynamic , but we cannot manage it as we want, it all depends on the Internet operator. . With these public IPs we will not be able to assign to our router the one we want, unlike the private ones that we can. Regarding the differences between static and dynamic public IP, we have:

  • The static public IP is the one that will never change and we will always have the same one on the Internet WAN of our router.
  • dynamic public IP is the one that changes for another after a certain time or after restarting our router.

As for the private IP , it is the one that identifies each of the devices that we have connected to our home or local network, such as an office or company. In this case, we refer to each of the IP addresses that the router’s DHCP server (or an external DHCP server) assigns to the PC, smartphone, etc. These are IP addresses that, by themselves, could not access the Internet, but there would be communication on the local network.

IP addressing and IP address classes

The IP address is the logical address working on the network layer. Currently two addressing schemes coexist, IPv4 with 32-bit addressing and IPv6, which is the standard of the future with 128-bit addressing. Regarding the IP addressing scheme, it is divided into 5 classes: classes A, B and C would be those destined for LAN and WAN . Regarding class D , they are a specific address for multicasting traffic and class E is for research and development .

A very important detail is that classes A, B and C have specific ranges for private addressing, these ranges are the ones that you can use at home or work, outside of these ranges all IP addresses are public, therefore , you should never use them unless they are under your control. You can see them in this table.

Once we know the basics of IP addresses, let’s see what an IP calculator is and how it works.

What is an IP calculator and how does it work

An IP calculator is a tool that, by means of given values, will allow us to obtain network values, allowing us to calculate their networks and their subnets. Those given values ​​from which we start are an IP address, either host or network, and a subnet mask, which will allow us to perform actions such as:

  • Identify the subnet address to which an IP address (IPv4) with a specific subnet mask belongs.
  • Represent 32-bit masks and IP addresses in binary.
  • Determine the range of addresses that we can assign to the hosts that belong to the identified subnet.
  • Calculate the number of IP addresses available on an IPv4 or IPv6 network.

One thing to comment on is that we have IP calculators for IPv4 and for IPv6, which we must use depending on our needs.

Examples of use of IPv4 and IPV6 networks

In this case, to carry out the examples we have chosen the IPTP calculator . In this case, it is a completely free online tool, we will only need an Internet browser and an Internet connection. An advantage that this IP calculator has over other similar ones is that it offers the calculation of IPV4 and IPv6 subnets. For example, if we put an IP address and a subnet mask in the IPv4 section, we will obtain these results by clicking on Calculate .

From here we can obtain values ​​as important as that it is Class C and Public Type . Depending on the subnet mask that we put, it will indicate the total number of hosts that fit in the subnet, and even the Wildcard mask and other very useful information quickly.

Now we move on to the IPv6 IP subnet calculator. There we add the prefix length and the IP address to finish by clicking on Calculate .

From this data, for example, we can obtain the total IPv6 addresses and the IPv6 range that we have with the configured prefix, depending on the prefix, we will have a greater or lesser number of hosts for each subnet.

Best IP calculators

On the Internet there are a large number of IP calculators, both for IPv4 and IPv6 networks, we are going to recommend some of them that we have used continuously, so that they are useful to you.

IP Calculator from IPTP Networks

This IP calculator is the one we have used in our example, it will allow us to calculate both IPv4 and IPv6 networks, and we can obtain a large amount of information such as the IP address, network address, addresses facing the hosts, broadcast address, number total IPs available for the hosts, the Wildcard mask, the type of IP class, if it is a public or private IP and much more information.

You can access the IPTP Networks IP calculator from here.

Aprendaredes IP Calculator

This IP calculator is also very complete, although in this case we can only use IPv4 networks. We can obtain a large amount of information such as network address, IP address of the hosts, the broadcast address, the number of available hosts, and we can even see in detail each and every one of the subnets if we are doing subnetting, something ideal if you are studying networks.

You can access the IP calculator of Aprendaredes from here.

Site24x7 Calculator

This IP calculator is also very complete, we have two separate IPv4 and IPv6 calculators, then we will put the direct links to these calculators. This tool will allow us to calculate the block of network addresses that we need for a certain number of hosts, we can also enter the mask or the address block, and it will automatically calculate the range of addresses, broadcast address, wildcard mask and even the address in network CIDR notation.

You can access the Site24x7 IPv4 calculator and also the IPv6 calculator from these links.

Calculator-Networking IP Calculator

Finally, we have the IP calculator of calculator-networks , we will have the same information that we have seen in the previous calculators. We will be able to see the complete network, the range of the hosts, broadcast, the type of public or private IP, and even a detailed explanation of how the subnets are calculated.

We also have applications for Android and iOS mobile phones of IP calculators, below, you can see some of them:


by Abdullah Sam
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